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(Modem 3 Sheets-Sheet 1.

L. H. PIERSON.

CONVERTIBLE DRILL PRESS OR SLOTTING MACHINE.

Patented May 4, 1886.

' INVBNTOR:

WITNESSES I m flaw 2 v BY .LCM Yuw ATTORNEYS.

" (ModeL) 3 Sheets-Sheet 2.

. L. H. PIERSON.

CONVERTIBLE DRILL PRESS 0R SLOTTING MACHINE. No. 341,165.

Patented Mav 4 1886.

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ATTORNEYS.

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(ModeL) L. H. PIERSON.

CONVERTIBLE DRILL PRESS 0R SLOTTING MACHINE.

Patented May 4, 1886.

3 Sheets-Sheet 3.

INVENTOR J/(MMMF ATTORNEYS.

UNITED STATES PATENT OFFICE.

LAURENCE I-l. PIERSON, OF SAN FRANCISCO, CALIFORNIA.

CONVERTIBLE DRILL-PRESS OR SLOTTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 341,].65, dated May 4. 1886- Application filed July 23, 1885. Serial No. 172,418. (ModeL) To all whom, it may concern.-

Be it known that I, LAURENCE HAIGHT PIERSON, of San Francisco, in the county of San Francisco and State of California, have invented a new and Improved Convertible Drill-Press or slotting-Machine, of which the following is a full, clear, and exact description.

The object of my invention is to provide a the frame and is directly attachable to the work which is to be slotted or drilled, and of feeding devices, hereinafter more fully set forth.

The invention also consists in various parts and details, hereinafter more fully set forth and described.

Reference is to be had to the accompanying drawings, forming part'of this specification,in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a front elevation, partly in section, of my improvement. Fig. 2 is a crosssection of the same on the lines at :vof Fig. 1. Fig. 3 is a plan view, partly in section, with top gears removed, showing the machine as a slotter. Fig. 4 is an end elevation of the transmitting device. Fig. 5 is a detail view of the speed-changing device. Fig. 6 is a vertical cross-section on the lines y y of Fig. 3, and Figs. 7, 8, and 9 are detail views of parts hereinafter more fully described.

The standard A is directly attached to the work to be slotted or drilled by suitable bolts or clamps or other devices. A pin, B, screwed into the standard A, connects the latter with the frame 0, in which slides the guide D, carrying the traveling head E. The pin B is made as heavy as possible, as all the strain in slotting and drilling acts upon it. The head of the pin B is formed into a worm-wheel, B, which meshes into the worm S, formed on the shaft S, which has its bearings in the frame 0, and on being turned gives a circular motion to the frame 0, the guide D, and the traveling allow the frame 0 to be turned, and yet not' have any lost motion. The frame 0 has a dovetailed recess, 0, in its upper face, to receive a dovetailed tongue, D, formed on the under side of the guide D, and extends at right angles from the latter, forming the crossslide D which is provided on its outer end with a handle, D to slide the guide D forward or backward ou the frame 0.

The guide D consists of the guideways D and D provided with dovetails and carrying the traveling head E, and of the end crosspieces, D and D in which is mounted the main shaft F.

The traveling head E consists of the front plate, E,which slides on the guideway D and is provided with suitable bearin gs, which carry the tool-spindle G and attachments, of the rear arm, E sliding on the guideway D* and carrying part of the transmitting and speedchanging device, and of the center arm, E which projects downward between the guideways D and D and forms a bearing for the main shaft F and part of the gear-wheels for imparting a rotary motion to the spindle G, and also carrying the device for imparting the up-and-down sliding motion to the tool holder or spindle G when the machine is used as a slotter. The main shaft F extends beyond the cross-end D of the guide D, and is provided with the beveled gear-wheel F,which is driven from the beveled pinion F, journaled on the movable shaft F and which pinion is provided or-made integral with the graded driving-pulley F The shaft F is mounted on the shaft F, and in its lower end is provided with a groove, F which slides on the segment F,

r on the same.

secured to the cross'end D, and having its center in the center of the shaft F. The shaft F can be secured at any angle and at any point on the segment F by the setscrew F so that the graded pulley F can be always kept in line with the pulley from which the drivingpower is derived. The extreme pulley carrying end of the shaft F is square, so that a handwheel can be attached to it to turn the shaft F by hand-power.

The shaft F is slotted its entire length between the cross-ends D and D so that the beveled pinion H, provided with a hub, H, and a key, H, which engages the slot in the shaft F, is rotated by the latter at any point The hub H has its bearing in and is held to an extension, E, of the center arm, E, of the traveling head E. The pinion H meshes into the beveled gear-wheel I, secured to the shaft I, which has its bearing in the center arm, E, of the traveling head E, and is provided with the slotted disk I, which imparts an up-and-down motion to the toolholder G by devices hereinafter more fully described.

The tool holder or spindle G is placed in suitable bearings on the front plate, E, of the traveling head E, and receives a rotary motion or an up-and-down sliding motion by devices which belong either to the drill-press or the slotting-machine; and in order to clearly understand both devices it will be necessary to describe each device separately, and therefore I will commence with the parts belonging to the drill-press proper, and then describe the changing to a slotting-machine.

The beveled gear-wheel I meshes into the V beveled pinion J, secured on the lower end of the vertical shaft J, which has its bearings in the arm Etof the traveling head E. The upper end of the shaft Jis provided with a nut, J and with a key, J which, when depressed in a corresponding keyway, J, on the beveled gear-wheel J secures the latter to the shaft J and rotates it with the same; but when in the position as shown in Fig. 2 the shaft J revolves without rotating the beveled gearwheel J The nut J holds the gear-wheel J in place.

An inclined shaft, K, which has its bearing in a projecting arm of the arm E, is provided with the beveled gear-wheel K, which meshes into the gear-wheel J In the center of the shaft K is placed a rod, K provided with a square offset, K which projects into a corresponding recess, L, of the shaft L, and imparts to the latter the rotary motion of the shaft K. The shaft L forms a continuation of the shaft K, and has its bearing in a projecting arm of the arm E, and is provided on its extreme upper end with the beveled gear wheel L which meshes into the beveled gearwheel L, placed on the tool-holder G. This gear-wheel L" is provided with a key, L, which fits loosely in a keyway, G, on the tool-holder G, so that the latter has a free up-and-down motion when the machine is changed into a slotter, and, in drilling, the gear-wheel L", by means of the key L, rotates the tool holder or spindle G.

The tool holder or spindle G is provided with an annular recess, in which is placed the sleeve G held on the spindle G by means of the set-screws G This sleeve G is provided with a toothed rack, G", into which meshes a gear-wheel, M, placed on the shaft M, which has its bearings on projections of the front plate, E, of the traveling head E. The gearwheel M is provided with a key, which fits loosely in a keyway on the shaft M, so that the gear-wheel M can be thrown in or out of gear with the rack G" by moving it on the shaft'M".

To the outer end of the shaft M is secured a worm-wheel, M which engages with the worm M, formed on the shaft M. This shaft M receives a rotary motion through its beveled gear-wheel M meshing into the beveled gear-wheel M, placed on the shaft M, which is revolved by turning the hand-wheel M secured to the shaft M An automatic feed motion is obtained by connecting, the same as shafts K and L, the shaft M", by means of the rod ll with the vertical shaft M", which is provided on its upper end with a gear-wheel,

M, which meshes into the gear-wheel L attached to the beveled gear-wheel L.

The operation of the drill-press is as follows: The main shaft F rotates the pinion H, which revolves the beveled gear-wheel I, which rotates the shaft J by means of the beveled pinion J. The key J is depressed into the recess J 4 on the beveled gear-wheel J so that 1 the latter rotates with the shaft J and causes the shafts K and L to rotate by means of the" gear-wheel K. The beveled gear-wheel L on the shaft L rotates the beveled gearwheel L which revolves the spindle G, and the gearwheel L rotating the gearwheel M supplies an automatic feed to the spindle G when the gear-wheel M is moved in gear with the rack G*. If the drill used is of a large caliber,the speed of the spindle G has to be diminished, which is accomplished by disconnecting the shafts K and L by withdrawing the rod K, with its square offset K ,from the recess L in the shaft L, and by throwing the gear-wheels K and K, placed on the eccentric-shaft K,in gear with the gear-wheels K" and L on the shafts K and L, respectively, by turning the eccentricshaft K In using the machine as a slotter the gearwheel J 5 is disconnected from the shaft J, the gearwheel M is thrown out of gear with the rack G, and the spindle G is prevented from turning by screwing up the bolts G An upanddown motion of the spindle G is attained by attaching to the crank-disk I in any suitable manner the pitman N, the upper end of which is pivot-ally secured to a detachable lug or pin, N, placed on the spindle G. The rotary motion of the crankdisk I is converted into a reciprocating motion imparted to the spindle G.

The feed arrangement for the slotting-ma- I claim as new, and desire to secure by Letters chine is derived from the main shaft F in the following manner: Near theinside of the cross end I) of the guide D is secured to the shaft F the spur-wheel O, which meshes into the gear-wheel O, revolving on a stud, O secu red in the cross end D. The gear wheel 0 is connected by the rod 0 with the forked lever O, which has its fulcrum on the feed-shaft P.

The latter has its bearings in the cross-ends D and D of the guide D, and passes through a nut secured in the lower end of the center arm, E of the traveling head E, so that when the screwshaft P is turned in either direction it causes the traveling head E to slide on the guideways D and D of the guide D. To the feed shaft P is secured a ratchet-wheel, P, placed between the forked end of the lever O, and on the latter is pivoted the double-ended spring-pawl 0 which can be engaged with the ratchet-wheel P on either side, by which a right or left hand motion is given to the feedshaft P. The gear-wheels O and O are in the same proportion as the driving beveled gearwheels H and I, so that the feed will work at every stroke of the slotter. The outer end of the lever O is connected by the short link Q to the crank-arm Q. secured to the shaft Q which is provided with the crank-arm Q". A rod, R, connects the crank-arm Q with the crank-arm R, fulcrumed on the shaft S,which is provided with the worm S, driving the worm-wheel B on the stud B, previously described. The crank-arm R is provided with the double-ended pawl R'Zwhich can be placed in contact with-either side of theratchet-wheel Pt, secured to the shaft S. This arrangement gives a circular feed motion to the slottingmachine when the pawl O is thrown out of contact with the ratchet-wh eel P and the pawl It is thrown in contact with the ratchet-wheel R on the shaft'S. The lever 0 acts then simply as a walking-beam to transmit the motion of the shaft F to the shaftS, by means of the connections before described, while the feedscrew P is at rest.

It will be seen that by the few changes before described the machine can be changed from a slotting-machine into a drill press, and vlce versa.

Each machine is complete in all its details and workings, but both derive their respective motions and feed from the main shaft and its attachments. The entire construction is very simple and effective.

Having thus described my invcntion, what I Patent, is-

1. The standard A, the pin B, the frame 0, the guide D, the traveling head E, and the tool-holder G, in combination with the main shaft F, the beveled gear-wheels H and I, the disk I, and the pitman N N, actuating said tool-holder, substantially as shown and described.

2. The standard A, the pin B, the frame 0, the guide D, the traveling head E, and the toolholder G, in combination with the main shaft F, the beveled gear-wheels H and I, the disk 1*, pitman N N, and the feed screw P, actuated by pawl-and-ratchet mechanism and actuating the tool-holder, carriage, or head, substantially as shown and described.

3. The standard A, the pin B, the worm wheel B, the frame 0, the guide D, the traveling head E, the tool-holder G, and the main shaft F, in combination with the shaft S and the worm S, substantially as shown and described.

4. The main shaft F, the driving beveled gearwheels H and I, the shaft I, and the crank'disk I, in combination with a connecting-rod, N, the stud N, and the tool-holder G, substantially as shown and described.

5. The main shaft F, the gearavheels O and O, the connectingrod 0 the lever O, and the double-ended spring-pawl O in combination with the feed-screw P, the ratchet-wheel P, and the traveling head E, substantially as shown and described.

6. Themain shaft F, the gear-wheels O and O, the connecting-rod 0 the lever O, the link Q, the crank -arni Q, the shaft Q}, the crank-arm Q, the connecting-rod R, the crankarm B, and the double-ended spring-pawl R", in combination with the ratchet-wheel R the shaft S, the worm S, and the worm-wheel B, formed on the stud B, substantially as shown and described.

7. The combination, with the standard A, frame 0, and the pin B, of the nut B and washer 13, substantially as shown and described. I

8. The standard, the supporting-pin, the frame, the guide, and mechanism, as described, foroperating the slotter and its feed jointly with the gear I J J K L L and shafts J and L, substantially as described.

LAUREN GE H. PIERSON.

\Vitnesses:

W M. PIERSON, SAM H. RYENSBURGER. 

